Located at Parliament Street, Connaught Place, Jantar Mantar is an astronomical observatory that was constructed in 1724 by Maharaja Jai Singh of Jaipur. The main purpose of the observatory was to predict the times and movements of the sun, moon and planets, which is today classified as astronomy. The observatory houses three distinct instruments - the Samrat Yantra, the Jayaprakash and the Mishra yantras.